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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'daf8b05fbc19574a7757ce8c28c9df0ec38cd6852f4e15ea56cac51e6dda05f4' 
  AND token = 'wSfgASahIuYkTVfjuTK7vVoiejjtWu6w0aRDRNcMj28=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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