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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '577e982ab7602a039e1e7c5038df97dcbe054508ba8595d2d0f2a6df3493af0f' 
  AND token = 'Qfe1zQwm99+pWDvallq3QkrwL9f4321GQJJRKBXGEBw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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