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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3faeeeddeb755355c55a22eff3c855e402f2f1c002d818fa8c262fce819eac4e' 
  AND token = 'H41e5xYk/BeJPpAe8Ad3ZfK79272w1I9YaYWVp2gqrk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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