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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fed2310d2f47ed84d20e9833a5db2932d9a1e7bb021172a99b2a4f705e1061b1' 
  AND token = 'Nweoi6c0bqDR8xLCpV+NjKTE8U1N5PmOKH57xhLEflk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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