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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '079932f7519673c2fe9a96d95612ecb868e6666371d3d02c5735334c9cb5c6de' 
  AND token = '1HWU+UlPuKaAvm90vwz7GqptqfUeErbrBfy/duQo3Zo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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