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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f934b9051b7d2867babc91f9fd4987f247f8191ecb25752998357c4fb695ec31' 
  AND token = 'xbCCaDh5Z6Q48xNe4FYDHQv095/8nyGbfD3+rTqLAbo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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