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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d32966e121b98eebd190b89d972e96bd059ff521a73638a8351aed4c26000d4' 
  AND token = 'ISM5rRhpqRzfuiZNahpo1RHUU0irpHVQcJbgS/rQif8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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