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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1831b6b8d0c70ee353efcbc97cc4b3a633fc54f55e015a9d622cff9632b863d5' 
  AND token = 'Lld9kljleFrHCS3i56FoWexKPPZYHE/uhDBgSTyokac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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