SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4758d2af93e25b044d1937c9747e4359b5e3e06c4bf60010776a40a50d8395ea' 
  AND token = 'K0ncBwTn6j/ntBQjhQs56J1uUJ+yuRBwrfb8CIYPQVw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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