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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eab2bd213333f83df74ee0484a589f8a0cc4f3ddd15891a9a2c517b73bab0806' 
  AND token = 'Yv0nFpNCh8+dPoi4btvEmaLHMJ2UX3JODcOYK9OQQ3M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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