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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5a79f07ac217c1a12eda154857f8bbb001f388ff7aff97be2e1af90c9aa30de' 
  AND token = 'qFXBld3q//FjcrpOLvEwz27A6ePWGoQvygCqdTKvjL0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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