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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e204a256ba9e9f9275d3a489fd81828de95d11ba74fd1181339e6d9658178310' 
  AND token = 'pnsB+0/CuFnWBWeRP+eY++tWgubiMvb5lIt932mPK7k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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