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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dca84c5b712386d51aafe2f32f50f3d4e9679d9a5de593247e011b90d2eccc08' 
  AND token = 'oRG0aHMez08xjpTpk8SPW+Gku/1sSEDCzmt3gLFLP3c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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