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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76eb4fd03ddd2fa83feb31ae16c5dd012651ab01e0ab35960afc6a529604a867' 
  AND token = 'Z6gYXPmzBRuZuJlBFkMcINEW2VSfT2/t3tdPILAtngI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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