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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3b0762f24c1105911dc3339e29e713fef209f1aeeba6f847960e75347e12f25' 
  AND token = 'fOLAxFcgCtO8dIhS/L5nd1N3v83LTSl60awQdEpr0AM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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