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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd864e1740165063c298967fc2c8d4795c5fd36f074e6c86a78d18d6d0f1f381' 
  AND token = '4JY5h6vXzIhG6lVxlP5ibjsRt387W4p3IsoLsOR6b4o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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