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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b08139f35916289f182f95e3500435abf6b8a319eb6f4c64c923700037480903' 
  AND token = 'GmaDzp+dDQRe5ZON6aPIaCc+LTXjqnIgOczcPESVoHU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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