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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd8cd01278d8ba65f8d2e07ea6e7fd3e5578054b1efde9612245d1e8d8d3d02e' 
  AND token = 'jEbq7I78lbd6fL7aFN153cMc1NyMbidvlZ4MKdgwmzI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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