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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41ae9b03b12e81245b4b4087383e0ce28b057f7a1fa451cd102f297f5ecd766b' 
  AND token = 'ZhR9fvttKu+0AjC1gCYbewYM9gR94SXj/kHjPyi6egg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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