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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af06bead0ad8b9562e6ef095ee9e9f869fbd62ad6a97111f94c3b086c62f2e02' 
  AND token = 'KP6Dz4KSbhlFKWcgVtFRz0g9JhMqLLd3VAFLa26ZMZI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}