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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9bb09ef922a20ccf447dc02f85665ab595fa17eef5e55d33957c9ffc2a28d6af' 
  AND token = '7pIjzWH8dYWDeyvz5Lsaz4ttcDWha/+AV3qo5Ca2LpQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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