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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8704a2cb1708834dafe12de66c29a31fc538e43a4001de7a42a9aadcbfcbcae9' 
  AND token = 'n7/Mmomq6nhRzUs0wfkPzB5oFSejaT1hJU/gRxrCQxI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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