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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a29490d35651cfafeb35154a66cd1cb84e60e0c12075125e3f6c95cf39bb123e' 
  AND token = 'A0bW4ukmVZU0OhQQUd079dnbyugHPs8IcOj8+lkRgrQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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