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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6cecb9f276e9506377e8045f8a15cc8f3a3c819058703735ab5576fd4afc518d' 
  AND token = 'Z1gsaYvoT0mSDMGUiZPkqIJAboOrO9HL1w8CnP2xWXA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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