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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14317b4faf910b8bf3add5b0f6a7dbb562535f025e5a139fffa830c1630b5ef3' 
  AND token = '6jxc7KWMs2Q6UgWDI0MObiBtGHehD0A8XamleMsYQOU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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