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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54577ce1a927f799058a60e5c9c23942bc8d65fccf9454b141cf3425aa063c73' 
  AND token = 'kB9GVDcYOzEMIms21ymrwef3Lp9m8JotP5m+ntMGkVs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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