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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57ee3601fcae1b09fc116ea0c480d885617b2cb1c5ae0585ca8d94b6ba4bfdbc' 
  AND token = '+08jNpthmiXoQgNekUqvR7td8ivVs6WjhvVYTFoZDYE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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