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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a765bf06276618ce1174c49fdb2e5e438f72a27ea731bab4c30aff022ea52dec' 
  AND token = '7eefQRyIzzCgIA8eoCVdNbS1+dhkWWL3bWrP7diURQU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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