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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c28b498a9993586fc69d1d078211f89300a202a8329ff19168dfcdb997bc8b7' 
  AND token = 'Ab0PfwXB/fL6syZmV4C8DT0IDxS4I3BLJe8wCiWnRrc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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