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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c48ebde7c8c7ab91ed54637858029d0e8a1a14832b93ccc96dadbc5cb65b55b' 
  AND token = 'E00Fav1CVeDtG4Iyiug8oaG92+k33NY33IMFNzJgKQs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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