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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3920a523e2b2b5fa83f12d10865e676bdb2017c0c506879787fb7c3012b7b0b' 
  AND token = 'jPsY0rPr4y8DfmOvwdMqn7vdc5fV0Jg4fNciEG6STg8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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