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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91a9b5ebc3af09d96ace27951725730e4873b2150d4a3edd60e490d829f2620c' 
  AND token = '55caIfMXlnKqIluoHVD7FSCeByqQxxdw+ZLDXW8cr0k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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