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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3bc4c5b443158819171eb849d9d1f92a221791b37f966725c82241c4571eddb8' 
  AND token = 'sWhXrWY53t13xvgNK1yyw14OyaX0GinU4X+pHzYFd1Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00100

JSON explain

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