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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a14b09a3de2417c096b3fe06fb33d9ea10e597742a91075fcba5343935cf4b8b' 
  AND token = 'FvPiyx7xHu3OxJ4g8H51I6aYwSZnoFSJEXWPpDD/CDY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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