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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7bed55d8eaf292fff26637eab416a4e53239e39f97bbd85f72584d08fb8f9e9' 
  AND token = 'e1oC5fYBO7NaCMzA901T2JjQtlJ6Mq7QVJ4BTB5mHm0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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