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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f2717dec143623d364f6f0d44c32e6b44a1653c61a864dd200ad15925e7985a' 
  AND token = 'q6kvMEMwRHMUMPO++w0m2B74oRjE7FdCLZ/P2T40+X8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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