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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '607f4139bd161989bc63eed6100358049a376b0189b5c162d8ae810d9cb38894' 
  AND token = 'do7cI0o70lcCHD3NNth7z9DhNQ3Y73+InrWd1xQgXT8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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