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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc383f81e3e0445e46d336e9cc8e55522d25871e29c30a56ffe4805a478f2a0f' 
  AND token = 'nt7zl914fmO95uEsUy7f5Tsx6KUgf6n2NSBapCb2ClA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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