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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2fa62e009f8db261ceba39c9d48f8bf6c723b5c66fb3e906463c3bbf025412cb' 
  AND token = 'Jz305xETVg9DBmm26W+tvHMbGQ7GWCv6W8xt0SXq4rc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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