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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64ed007b66aa1204a4eb6579bdac0d517aab5151542dc8b2e1ca020065f6761d' 
  AND token = 'HfmCx7sXxNjBKXgIStKm3wWquMZtvQyzZ9C34e+6wCY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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