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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba55bd71fcfb5010b44d616995c8b4fa3bdb22a3f3f761313cd01f632b2d3baf' 
  AND token = 'li2WWV+qVTdv47/qPGGZOGQi1E0VUI2sZ3+g9xpvvdQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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