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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a48529350e4bb0ffc8c3f2ec0d1a7077b2c39441cf1320059ac8d1084d4cc83' 
  AND token = 'hnNtaOKGLM/5R4sx10FX1bIv/QJtmjNFWJ1BesWByVY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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