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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2514faf3edef73fac8facf0b6a380fd015f2e2fa5156c76a25501ccd82db60a' 
  AND token = 'n2zZJi/gtYM7bHUgGQj+0iyad6BDn9sI+eIt9497fsM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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