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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ffbe75acef6b9cd9f28c7e1308d29ac577dd2527948042da8d0a256ab41705eb' 
  AND token = 'Mn7LQPATt7xkMlC+c/vqVWlWblqXNOak8sGDgWunaI0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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