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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d2982addfce23793a4048f63f51cbf67bd5c30c90618b3f34e51e8ca22b9d3b' 
  AND token = 'eBsAtLxj/OGz1AfJwVtFzya/Dp3u7Fu7tVyOtirSicM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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