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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3bd561b556668fbfbda656cb701d5399ab73b16e7052d27cc5bd5d50dc2158ad' 
  AND token = 'fZaFbUk4y8o62SESoksx0thzK/kmiNDxkewGYy6qjgU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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