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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e5a70b636efad5468007a15b377b425d49cbc6ae9d5c945f4159a2e75ddde2d' 
  AND token = '6hzXmJrrnGelDi5Keq+HjCuFcJ6kU8VczLB04lfht3E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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