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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a841fba3d0b50c9e9e94d124fe523e331ec840fb34b00aaf4ab2363976ac94d0' 
  AND token = 'Liy0DxUsva/PuHHSWEg8qY34QbP3O/ALUo3N6dnz490=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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