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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6dbf85be0af716fde038a2d33def65380164d1f5f6be1488e1e0e2bd6ec0ed76' 
  AND token = '57Vy86mGm0z+L5dqQS3ZZhBag+EHCBLGk1FNe5TmZuA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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