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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff8a043e77e1494370e220f7e2aa804d3ed5616cf0f3db1852b9ca1e7a9d498f' 
  AND token = 'cCZMYmMTDx6sUqo48EapCBzGSiqyy3RVSpVpjjYQ7ME=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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