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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34d49fad4719fbf85af5b1b7e2e6aa657f351c3c70e37ea608495a93061b70e1' 
  AND token = '6Cze/CtKaNlLgP7DUgxm4HCQaSKaJzkwoB8ImlbYixo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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