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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8bce26512fc087e3186202b99133283b0a853f6fbcd21b96d6e06d96bc6390a7' 
  AND token = '51H4z9EmZTjUdAcFx51i+kQ3X7SmljjwUTvHCjfWC2g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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