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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc21af494b45b57df05c65f5f59edc70d39172b9f83f1f6c21f0da4f175fd7b3' 
  AND token = 'FOKVrr2RmsQ0kEMHIFsfebdo9MEYM5cRG0HsTYm223M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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