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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b548a43df747db9b1b107e670fb9748fd1ebd4fd3309dcc42d13f517680edba6' 
  AND token = '+OvI8CxGE7kZtPARI2R1qD+gXfFCHYKKLUAuOA2cioY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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