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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5125fa5843543b461322dd2d6788fb718d71cd7b8bb0d3966e1ecdd7d8d3a9e9' 
  AND token = 'eMjtTpOrMmPz5C6nHAJGiCY2NGazD28zIETbV0vosXU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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