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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2935f1f3d93464ffdaeafd08051611ce8c4ba39c9d63575c480d4832e66e17eb' 
  AND token = 'inlgoE+WgqUCSZS5ef5I7GJPrqJ+j66E489nUseAErk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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