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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71918664e7dad92ab8bc192a704abd17288fa64ffdf11ea6a73947d23f8dd5a8' 
  AND token = 'f7gMgIJzzMO3/vFpHDDz6SJv10vghZA8NATGBg7khxM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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