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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3ce851d9b23d105a9c847e1760ebbdeeffb20536a4cf7316b539e62d46fe1b4' 
  AND token = 'jt8myesnEpV/k39QkMleagIO9S9eLs/tUp5m4dj1RcU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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