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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0edd0d6c89465981cc0d0b7455b835f1b3be67c76be788c5e4d452572703e12' 
  AND token = 'K1UVsPP5O460ArsB4CbKXzcSDnta5EtIG6yrAegHdtU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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