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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f007c1878cc62b4c0c8a32f06261d87246f4325ff04e2e04fb0f5dc2f5d776a' 
  AND token = 'leZiZl7sHYRHvV63B521zZBLjDSnbN5OkNu2SbEnMpM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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