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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd10007ee6af16f555fec617dd9333ff28ce11c90a66bfaaefa99fcee77ba9693' 
  AND token = '6/MqRW2Edsq7qlHUzloTXQ3jpJ722a5ryVhG5BxZymk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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