SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '53a97b7aa4131640dcfd9ac6408b69c7e42828115245f31c6f1ff4cbcffe96e6' 
  AND token = 'Hr4mrGMqqMghDjFHB/qFTITuVsJDzZFWzsUOjpnuKHg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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