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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8e267a6d4d0279a9b63da5a9fb0cf0fd38b7cba8d372b55eca7ed9fcca40ba0' 
  AND token = 'uguH60NEBuwg8DVBpLep7+30rD0y96EhPgjWXOKny1s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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